I'd have to go with Kage Minato.

Not only does he provide the res buff, but he can make more of a combo with his standard, and look cool while doing so. (10 combo+tag), compared to 6 combo (However, this supports his mystery). Note that kage's standard only afflicts tag if he gets a 10 combo, however. Later it'll be changed for a guranteed tag.

Mystery wise depends on the situation, and the team in question. Kage can do far more too the enemy then Jonin, assuming you attack a tagged enemy. Otherwise Jonin would win, especially if he can pull of a 6 combo each round. Even then, kage would have to hit a tagged opponent to get off his full mystery. Though, kage has a lot of tag.

(Later on, kage's mystery goes to multi team instead of single full team. Same radius though, 1 team=9 units, it'll just become more useful in ranked)

It's a tie in dodge passives.

Instead of having a chase, kage has flying raijin. Which is a powerful random unit attack, similar to that of an extra standard. This will also cause tag. And later on, each time he uses it, he'll get a scaling buff. Jonin Minato has the scaling buff right now, each time he triggers his mystery. So if you were to paralyze Jonin, he can't get that buff. Otherwise, he c*e his combo twice.

One of Jonin's passives are taken up for the scaling buff on the chase. Kage gets that installed onto his Raijin jutsu, instead of it just being it's own skill. Leaving room open for kage to give his entire side a 40% buff.

So...yesterday, I noticed that if my Minato was in the +attack place, he'd get to be over 10k attack. So I did some of the math.

+30% from Iruka

+40% from wind main

+40% from barrier (Gaara mainly, I actually main water, but this is just an instance thingy)

+9% each round (assuming you somehow pull it off without Bee)

...He hit over 1mil attack...though, he does lose his first buffs, I just didn't unadd them. But if buffs were permanent........

That's what happens

(This was Hokage)